As the name implies, this is the story of two brothers who are very different from each other. Senior Sam is a worthy citizen, a model soldier, sportsman and family man; junior Tommy is a "stray sheep", who was recently released from prison where he was serving a sentence for armed robbery. Sam goes as a volunteer to Afghanistan, leaving his wife and two daughters at home. During a mission, his helicopter gets shot down over the sea and everyone considers him dead. Tommy, in obedience to a sense of duty and fulfilling the promise given to his brother, takes responsibility for his family. He is moving closer to his brother's wife Grace and feelings erupt between them; they can not resist. But Sam, who was believed to be dead, once returns.